Support for Swift 5 / Xcode 10.2

1.8.0

update .swift-version 5.0

Adapted custom handle image frame to be decided according to image size

Fixed bugs on #11

Bug fix

Fixed bugs on #4 and #6.

#4

Handle border width & color not working

#6

Min label visible after setting disableRange

add TapticEngine

• Add feedback with Taptic Engine when enableStep = true on iOS 10.
• Set border color value form property. #5

Add setupStyle() method.

When subclassing RangeSeekSlider and setting each item in setupStyle(), the design is reflected in Interface Builder as well.

Update properties from 'public' to 'open'.

• Update properties from 'public' to 'open'.

Add labelsFixed

Add labelsFixed. If set true to this property, fixes the labels above the slider controls.

Add initialColor

Add initialColor. If set UIColor to this property, the color of the entire slider when the handle is set to the minimum value and the maximum value.

Add RangeSeekSliderDelegate methods

• Add rangeSeekSlider(_:stringForMinValue:) -> String?, rangeSeekSlider(_:stringForMaxValue:) -> String? in RangeSeekSliderDelegate.
• Delete minValueString, maxValueString.

Add minValueString, maxValueString

• Add string of the label when the handle is set to the minimum (or maximum) value.
• Performance fix.